Configure IP policies to form a unified database of route policies that Routing Information Protocol (RIP) or Open Shortest Path First (OSPF) can use for filtering tasks.
A policy is identified by a name or an ID. Under a given policy you can have several sequence numbers, each of which is equal to one policy in the old convention. Each policy sequence number contains a set of fields. Only a subset of those fields is used when the policy is applied in a certain context. For example, if a policy has a configured set-preference field, use only when the policy is applied for accept purposes. This field is ignored when the policy is applied for announce and redistribute purposes.
You can apply one policy for one purpose, for example, RIP announce on a RIP interface. All sequence numbers under the given policy apply to that filter. A sequence number also acts as an implicit preference; a lower sequence number is preferred.